remote turn-on from m2-atx -> relay -> monitor

Any of you fine folks know _exactly_ when the remote turn on from the M2-ATX goes on and off, relative to windows? I am powering my lilliput off the 12v output, but want to try and avoid the myriad flashing and multiple screens (bios/boot/welcome) when windows comes up, and the shutdown screen when it goes down, by running the 12v through a relay switched by the remote line.